No sleep training with our first child. He slept in our bed untill he was 8yo & then in our room untill he was 11-12. Second child we using sleep training and it works well unless he is sick. We started at 12months and he is almost 2 now. It does make you feel bad when he cries but now its not 5 min. Before he sleeps sound. He wakes and plays awhile before wanting out & then plays well otherwise. But i do see some signs of disobedience. But this has worked best so far.